<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="123" method="post">
    <p>账号:<input type="text" name="" id="" value="请输入账号:"></p>
    <p>密码:<input type="password" name="" id=" " maxlength="8" placeholder="请输入密码"></p> 

    <p>男:<input type="radio" name="1231"><br>
       女:<input type="radio"   name="1231"></p>
       <!-- 选中一个就会取消另外一个 -->
    <p>
        吃饭<input type="checkbox"   name="123" checked><!--定义name 然后 后面可以默认是否勾选 checked -->
        睡觉<input type="checkbox"   name="123" checked>
        打豆豆<input type="checkbox" name="123" checked >
    </p>

    <input type="file" name="" id="" multiple>
    <!-- 后面加multiple 可上传多个文件 -->

<select name="123" id="" >

    <option value="">上海</option>
    <option value="" selected>广东</option>
    <option value="">深圳</option>
    <option value="">北京</option>
    <option value="">武汉</option>
</select>
<textarea name="" id="" >
    个人简介
</textarea>
<input type="radio" id="1231" name="qq">
<label for="1231">男</label>
<input type="radio" id="12311" name="qq">
<label for="12311">女</label>


<label><input type="radio">男</label>

    </form>
</body>
</html: